Improvement in hollow augers



N. PETERS, FMOTC UTHOuRA waited tait@ @anni @Mitra Letters Patent No. 106,919, dated ugust`-30, 1870.

IMPROVEMENT IN HOLLOW AUG-ERS.

The Schedule referred to in these Letters Patent and making part of the same.

` Hollow' Angers, of which the following is a full, clear,

and exactV description, reference being had to the accompanying drawing forming part ot'nthis speci fication,

in which- Figure 1.1epresents a'side or longitudinal view of a hollow auger constructed in accordance with my invention;

Figure 2, a face view of the same;

' Figure 3, a longitudinal section ot' said auger; and

Figure 4 is a face view of a scroll used for adjusting the c utters to or from their work. 4

Similar letters ot' reference indicate corresponding parts.

My invention relates to an expanding or universal hollow auger, applicable to the cutting of round tenons and other work, and which embraces a peculiar attachment of the cutters by means of a screw-pivot and locking-screw, with slot, combined, to facilitate the setting of the cutters at their points relatively to the center of the auger. Y

A hollow auger, constructed in accordance with this invention, and which may be worked in a bit-stock or otherwise, will be found very convenient and efficient,-

Referring to the accompanying drawing- A represents the hollow spindle of' the auger, which I prefer to cast in one piece, with an annular faccplate, B, in front.

[his face-plate is slotted radially, to provide for the adjustment-or setting in and out, therein or on, ot' the cutter-slides C C, and intermediate steadying-dogs, D D, to adapt the auger to different sizes ol" work, or to .gire to it its expanding or universal character.

Said face-plate may be provided with any number of such cutter-slides or holders and steadying-dogs, all of which are operated by an entire scroll or ring, E, haring a continuous spiral thread, b, on its face, and which scroll is arranged to turn on, the spindle A, at back of the face-plate B, and so that its thread b tits within pins or ridges c c, in or onthe backs of the cutter-slides C C and dogs D D. By using au entire` scroll, the adjustment of the cutter-slides and dogs may be made continuous and in reverse directions.

F is a screw clamping-ring, made to t a screwthread, d, on thespindle in rear of the scroll E, and serving to lock the scroll, and, through it, the cutterslides and dogs', atte-r the necessary adjustment of these devices has been inade;'also, to release them when required. g

G G are the cutters, arranged on the faces of the slides C C, and being secured thereon, with facility for swiveling or adjusting them, by means ot screwpivots e e, in the centers or bodies of the cutters, and locking-screws,- ff, arranged to pass through -slots g g, outside of or beyond the screw-pivots. v

AThis mode of attaching the cutters secures the proper centering of them, or provides for the. adjustment of them after sharpening, and at other times, so that the cutting-points h h ot' two`opposite cutters will lie in one and the same line, a: x, drawn through the center of the auger, which is the propel' positionA for' the noses or cutting-points 'ot' 'the' cutters, and which, by. variation iu shape 'of the cutters, consequent on sharpening them, makes it, otherwise than `by the means described, difficult to secure.

It is preferred to make the faces of the cutter-slides' slightly concave, and the backsof theg" cutters correspondingly convex,\\'hereby, on tightening down the screw-pivots'e e, a steady outside or edge bearing is secured for the cutters.

The cutter-slides C C are formcdon their faces with clearance spaces or recesses, It' k, beneath the front or cutting-edges oi' the cutters, to provide for the'free escape ofjchips from or aboutthe cutters.

Vhat is here claimed, and desired-to be secured by Letters Patent, is-'L 4 The cutters G, secured, as described, to the cutterslides C', by means of the screw-pivots ,Hlocking-screws f, and slots g, and arranged for c,operati-10u in pairs or sets on opposite sides of the center-fof the spindle A, substantially as specified.

AUSTIN FQCUSHMAN. Witnesses: y

GEORGE G. Sim., Louis P. WALDO. 

